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| author | Krzysztof Wilczyński <kw@linux.com> | 2021-06-03 03:01:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-20 17:16:12 +0300 |
| commit | 1b78ad07da08ca15c47af0669d5a4e4f896cbb3c (patch) | |
| tree | ec895330c3184ba4516d53bcdcb27b3bd2372198 /drivers/pci/pci-label.c | |
| parent | 6f8ab706a62e2e2cf3c390b0c46f0bedbb8b1028 (diff) | |
| download | linux-1b78ad07da08ca15c47af0669d5a4e4f896cbb3c.tar.xz | |
PCI/sysfs: Fix dsm_label_utf16s_to_utf8s() buffer overrun
[ Upstream commit bdcdaa13ad96f1a530711c29e6d4b8311eff767c ]
"utf16s_to_utf8s(..., buf, PAGE_SIZE)" puts up to PAGE_SIZE bytes into
"buf" and returns the number of bytes it actually put there. If it wrote
PAGE_SIZE bytes, the newline added by dsm_label_utf16s_to_utf8s() would
overrun "buf".
Reduce the size available for utf16s_to_utf8s() to use so there is always
space for the newline.
[bhelgaas: reorder patch in series, commit log]
Fixes: 6058989bad05 ("PCI: Export ACPI _DSM provided firmware instance number and string name to sysfs")
Link: https://lore.kernel.org/r/20210603000112.703037-7-kw@linux.com
Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/pci/pci-label.c')
| -rw-r--r-- | drivers/pci/pci-label.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c index a5910f942857..9fb4ef568f40 100644 --- a/drivers/pci/pci-label.c +++ b/drivers/pci/pci-label.c @@ -162,7 +162,7 @@ static void dsm_label_utf16s_to_utf8s(union acpi_object *obj, char *buf) len = utf16s_to_utf8s((const wchar_t *)obj->buffer.pointer, obj->buffer.length, UTF16_LITTLE_ENDIAN, - buf, PAGE_SIZE); + buf, PAGE_SIZE - 1); buf[len] = '\n'; } |